Xerox 7750DXF - Phaser Color Laser Printer Service Manual page 100

Troubleshooting Procedure (Continued)
Step Actions and Questions
6 Does the front panel indicate the fans are
ON?
7
Does the LVPS fan revolve at high speed?
8 1. Check for voltage at J214-4.
2. Is +24 VDC present?
9 Does the front panel indicate the fans are
ON?
3-34
Yes
Replace the rear
fan.
The fans are
operating
correctly. If the
problem persists,
replace the engine
control board.
Go to step 9.
Replace the LVPS
assembly.
Phaser 7750 Printer Service Manual
No
Check the wiring
tot he rear fan, if
the wiring is OK,
replace the
engine control
board.
Go to step 8.
Check the wiring
to the LVPS fan, if
the wiring is OK,
replace the
engine control
board.
Check the wiring
to the LVPS fan, if
the wiring is OK,
replace the
engine control
board.